单项选择题
A.show subscriber
B.show l2tp tunnel
C.show l2tp session
D.show tunnel session
单项选择题 Which sequence of messages demonstrates the communications between the LAC and LNS when theyestablish an L2TP session?（）
单项选择题 Which statement describes the function of the LNS in a L2TP environment?（）
单项选择题 Which command parameter configures a password of connection-to-lac for an L2TP tunnel on an LNS?（）